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Re:Dear devs: Plus signs are valid by Tomte on Tuesday November 23, 2021 @11:46AM (#29320024)
You're right and still it's pure stubbornness on your part. A waste of energy.

The world won't change because you say so. Just use a dash to separate your constituent parts instead of a plus sign, and you won't have that problem ever again.

(I know someone who has been complaining about exactly this for more than twenty years now. Surprisingly it never seems to get old for him. Some people just need a "standard complaint".)

Re:Dear devs: Plus signs are valid by JohnHaugeland on Tuesday November 23, 2021 @02:23PM (#29322071)
Plus has different behavior on Google mail, is why.

Foo+anything@ goes to foo@. This is an easy way to track who's selling your email.

Not every complaint you don't understand is invalid

Re:Dear devs: Plus signs are valid by alexvoda on Wednesday November 24, 2021 @05:54AM (#29328766)
Maybe that IS the reason some services treat it as an illegal character. They know how Gmail works and want to prevent you from figuring out what they do with your email.